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          <h1 class="post-title" itemprop="name headline">原生项目中集成ReactNative</h1>
        

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        <h2 id="摘要"><a href="#摘要" class="headerlink" title="摘要"></a>摘要</h2><p><img src="https://ss1.baidu.com/6ONXsjip0QIZ8tyhnq/it/u=2313441805,633279189&amp;fm=173&amp;s=4D18EA1ACED68C8AF8F115CB0300B0B0&amp;w=639&amp;h=383&amp;img.JPEG" alt=""></p>
<p>采用ReactNative来写应用有一段时间了．一般都是全新建立ReactNative的项目.因为时间的原因,现有的原生项目只能逐步改为ReactNative页面.期间碰到一些问题记录下来.</p>
<h2 id="原生传值给ReactNative界面"><a href="#原生传值给ReactNative界面" class="headerlink" title="原生传值给ReactNative界面"></a>原生传值给ReactNative界面</h2><p>原生<code>UIViewController</code>是不能直接调用RN的方法.只能是<code>UIViewController</code>的<code>View</code>赋值一个<code>RCRootView</code>对象,来承载RN的界面.以iOS为例(同下),原生应用接入RN界面的代码如下:</p>
<figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//保存当前的navigationController. 进入RN页面后,就不能获取到当前navigationController了, 只能通过这种方式来获取,实现popViewController功能.</span></span><br><span class="line">AppDelegate *app = (AppDelegate *)[[<span class="built_in">UIApplication</span> sharedApplication] delegate];</span><br><span class="line">app.nav = <span class="keyword">self</span>.navigationController;</span><br><span class="line"></span><br><span class="line"><span class="built_in">NSString</span> * gid = [TGDataCenter sharedTGDataCenter].guideInfo.sid;</span><br><span class="line"><span class="built_in">NSURL</span> *jsCodeLocation = [<span class="built_in">NSURL</span> URLWithString:<span class="string">@"http://192.168.1.23:8081/MyAlum.bundle?platform=ios"</span>];</span><br><span class="line"><span class="comment">//  NSURL *jsCodeLocation = [[NSBundle mainBundle] URLForResource:@"bundle/index.ios" withExtension:@"jsbundle"];</span></span><br><span class="line">RCTRootView *rootView =</span><br><span class="line">[[RCTRootView alloc] initWithBundleURL : jsCodeLocation</span><br><span class="line">                        moduleName        : <span class="string">@"MainScreen"</span></span><br><span class="line">                        initialProperties : @&#123;</span><br><span class="line">                                            <span class="string">@"gid"</span> : gid</span><br><span class="line">                                            &#125;</span><br><span class="line">                        launchOptions    : <span class="literal">nil</span>];</span><br><span class="line"><span class="comment">//TTReactNativeCtrl 是一个自定义的`UIViewController`</span></span><br><span class="line">TTReactNativeCtrl *vc = [[TTReactNativeCtrl alloc] init];</span><br><span class="line">vc.view = rootView;</span><br><span class="line">vc.hidesBottomBarWhenPushed = <span class="literal">YES</span>;</span><br><span class="line">[<span class="keyword">self</span>.navigationController pushViewController:vc animated:<span class="literal">YES</span>];</span><br></pre></td></tr></table></figure>
<h2 id="关于官方教程"><a href="#关于官方教程" class="headerlink" title="关于官方教程"></a>关于官方教程</h2><p>教程对于<code>现有应用集成RN</code>,讲得少,只是以原生跳转RN界面传值的方法,做了简单说明.如果项目中使用<code>react navigation</code>第三方导航的时候,就不适用了.通常的做法就是通过<code>this.props.screenProps</code>来传值给RN界面.</p>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> React <span class="keyword">from</span> <span class="string">'react'</span>;</span><br><span class="line"><span class="keyword">import</span> &#123;</span><br><span class="line">  AppRegistry,</span><br><span class="line">  StyleSheet,</span><br><span class="line">  Text,</span><br><span class="line">  View,</span><br><span class="line">  TouchableOpacity,</span><br><span class="line">  Image</span><br><span class="line">&#125; <span class="keyword">from</span> <span class="string">'react-native'</span>; </span><br><span class="line"></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> <span class="class"><span class="keyword">class</span> <span class="title">PersonalStack</span> <span class="keyword">extends</span> <span class="title">React</span>.<span class="title">Component</span> </span>&#123;</span><br><span class="line">  render()&#123;</span><br><span class="line">    <span class="comment">// StackNavigator **only** accepts a screenProps prop so we're passing</span></span><br><span class="line">    <span class="comment">// initialProps through that.</span></span><br><span class="line">    <span class="comment">// MyStack 是一个StackNavigator </span></span><br><span class="line">    <span class="keyword">return</span> (&lt;MyStack screenProps=&#123;this.props&#125;/&gt;);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">// 整体js模块的名称</span><br><span class="line">AppRegistry.registerComponent('PersonalStack', () =&gt; PersonalStack);</span><br></pre></td></tr></table></figure>
<p>通过这种方式,就可以在RN的界面用<code>this.props.screenProps</code>来获取原生传递过来的数据.</p>
<h2 id="原生项目的多入口问题"><a href="#原生项目的多入口问题" class="headerlink" title="原生项目的多入口问题"></a>原生项目的多入口问题</h2><p>因为要逐步替换页面, 所以不可避免的出现一个原生项目,多个RN入口. 目前用到的方法,就是在<code>index.ios.js</code>文件中引入各个js页面.并且把它们作为模块注册在这个文件里.这样做的好处:</p>
<ol>
<li>原生中可以根据模块名称进行传值.</li>
<li>打包的时候,只用<code>index.ios.js</code>进行打包.</li>
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  <script type="text/javascript">
    // Popup Window;
    var isfetched = false;
    var isXml = true;
    // Search DB path;
    var search_path = "search.xml";
    if (search_path.length === 0) {
      search_path = "search.xml";
    } else if (/json$/i.test(search_path)) {
      isXml = false;
    }
    var path = "/" + search_path;
    // monitor main search box;

    var onPopupClose = function (e) {
      $('.popup').hide();
      $('#local-search-input').val('');
      $('.search-result-list').remove();
      $('#no-result').remove();
      $(".local-search-pop-overlay").remove();
      $('body').css('overflow', '');
    }

    function proceedsearch() {
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay"></div>')
        .css('overflow', 'hidden');
      $('.search-popup-overlay').click(onPopupClose);
      $('.popup').toggle();
      var $localSearchInput = $('#local-search-input');
      $localSearchInput.attr("autocapitalize", "none");
      $localSearchInput.attr("autocorrect", "off");
      $localSearchInput.focus();
    }

    // search function;
    var searchFunc = function(path, search_id, content_id) {
      'use strict';

      // start loading animation
      $("body")
        .append('<div class="search-popup-overlay local-search-pop-overlay">' +
          '<div id="search-loading-icon">' +
          '<i class="fa fa-spinner fa-pulse fa-5x fa-fw"></i>' +
          '</div>' +
          '</div>')
        .css('overflow', 'hidden');
      $("#search-loading-icon").css('margin', '20% auto 0 auto').css('text-align', 'center');

      $.ajax({
        url: path,
        dataType: isXml ? "xml" : "json",
        async: true,
        success: function(res) {
          // get the contents from search data
          isfetched = true;
          $('.popup').detach().appendTo('.header-inner');
          var datas = isXml ? $("entry", res).map(function() {
            return {
              title: $("title", this).text(),
              content: $("content",this).text(),
              url: $("url" , this).text()
            };
          }).get() : res;
          var input = document.getElementById(search_id);
          var resultContent = document.getElementById(content_id);
          var inputEventFunction = function() {
            var searchText = input.value.trim().toLowerCase();
            var keywords = searchText.split(/[\s\-]+/);
            if (keywords.length > 1) {
              keywords.push(searchText);
            }
            var resultItems = [];
            if (searchText.length > 0) {
              // perform local searching
              datas.forEach(function(data) {
                var isMatch = false;
                var hitCount = 0;
                var searchTextCount = 0;
                var title = data.title.trim();
                var titleInLowerCase = title.toLowerCase();
                var content = data.content.trim().replace(/<[^>]+>/g,"");
                var contentInLowerCase = content.toLowerCase();
                var articleUrl = decodeURIComponent(data.url);
                var indexOfTitle = [];
                var indexOfContent = [];
                // only match articles with not empty titles
                if(title != '') {
                  keywords.forEach(function(keyword) {
                    function getIndexByWord(word, text, caseSensitive) {
                      var wordLen = word.length;
                      if (wordLen === 0) {
                        return [];
                      }
                      var startPosition = 0, position = [], index = [];
                      if (!caseSensitive) {
                        text = text.toLowerCase();
                        word = word.toLowerCase();
                      }
                      while ((position = text.indexOf(word, startPosition)) > -1) {
                        index.push({position: position, word: word});
                        startPosition = position + wordLen;
                      }
                      return index;
                    }

                    indexOfTitle = indexOfTitle.concat(getIndexByWord(keyword, titleInLowerCase, false));
                    indexOfContent = indexOfContent.concat(getIndexByWord(keyword, contentInLowerCase, false));
                  });
                  if (indexOfTitle.length > 0 || indexOfContent.length > 0) {
                    isMatch = true;
                    hitCount = indexOfTitle.length + indexOfContent.length;
                  }
                }

                // show search results

                if (isMatch) {
                  // sort index by position of keyword

                  [indexOfTitle, indexOfContent].forEach(function (index) {
                    index.sort(function (itemLeft, itemRight) {
                      if (itemRight.position !== itemLeft.position) {
                        return itemRight.position - itemLeft.position;
                      } else {
                        return itemLeft.word.length - itemRight.word.length;
                      }
                    });
                  });

                  // merge hits into slices

                  function mergeIntoSlice(text, start, end, index) {
                    var item = index[index.length - 1];
                    var position = item.position;
                    var word = item.word;
                    var hits = [];
                    var searchTextCountInSlice = 0;
                    while (position + word.length <= end && index.length != 0) {
                      if (word === searchText) {
                        searchTextCountInSlice++;
                      }
                      hits.push({position: position, length: word.length});
                      var wordEnd = position + word.length;

                      // move to next position of hit

                      index.pop();
                      while (index.length != 0) {
                        item = index[index.length - 1];
                        position = item.position;
                        word = item.word;
                        if (wordEnd > position) {
                          index.pop();
                        } else {
                          break;
                        }
                      }
                    }
                    searchTextCount += searchTextCountInSlice;
                    return {
                      hits: hits,
                      start: start,
                      end: end,
                      searchTextCount: searchTextCountInSlice
                    };
                  }

                  var slicesOfTitle = [];
                  if (indexOfTitle.length != 0) {
                    slicesOfTitle.push(mergeIntoSlice(title, 0, title.length, indexOfTitle));
                  }

                  var slicesOfContent = [];
                  while (indexOfContent.length != 0) {
                    var item = indexOfContent[indexOfContent.length - 1];
                    var position = item.position;
                    var word = item.word;
                    // cut out 100 characters
                    var start = position - 20;
                    var end = position + 80;
                    if(start < 0){
                      start = 0;
                    }
                    if (end < position + word.length) {
                      end = position + word.length;
                    }
                    if(end > content.length){
                      end = content.length;
                    }
                    slicesOfContent.push(mergeIntoSlice(content, start, end, indexOfContent));
                  }

                  // sort slices in content by search text's count and hits' count

                  slicesOfContent.sort(function (sliceLeft, sliceRight) {
                    if (sliceLeft.searchTextCount !== sliceRight.searchTextCount) {
                      return sliceRight.searchTextCount - sliceLeft.searchTextCount;
                    } else if (sliceLeft.hits.length !== sliceRight.hits.length) {
                      return sliceRight.hits.length - sliceLeft.hits.length;
                    } else {
                      return sliceLeft.start - sliceRight.start;
                    }
                  });

                  // select top N slices in content

                  var upperBound = parseInt('1');
                  if (upperBound >= 0) {
                    slicesOfContent = slicesOfContent.slice(0, upperBound);
                  }

                  // highlight title and content

                  function highlightKeyword(text, slice) {
                    var result = '';
                    var prevEnd = slice.start;
                    slice.hits.forEach(function (hit) {
                      result += text.substring(prevEnd, hit.position);
                      var end = hit.position + hit.length;
                      result += '<b class="search-keyword">' + text.substring(hit.position, end) + '</b>';
                      prevEnd = end;
                    });
                    result += text.substring(prevEnd, slice.end);
                    return result;
                  }

                  var resultItem = '';

                  if (slicesOfTitle.length != 0) {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + highlightKeyword(title, slicesOfTitle[0]) + "</a>";
                  } else {
                    resultItem += "<li><a href='" + articleUrl + "' class='search-result-title'>" + title + "</a>";
                  }

                  slicesOfContent.forEach(function (slice) {
                    resultItem += "<a href='" + articleUrl + "'>" +
                      "<p class=\"search-result\">" + highlightKeyword(content, slice) +
                      "...</p>" + "</a>";
                  });

                  resultItem += "</li>";
                  resultItems.push({
                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x" /></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x" /></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
  </script>





  

  

  

  
  

  

  

  

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